build python binding error on windows 10,msvc14,python3.6.

```
D:\local\boost_1_67_0\boost/python/operators.hpp(223): error C2065: "op_": undeclared identifier
D:\local\boost_1_67_0\boost/python/operators.hpp(223): error C2059: Syntax error: ">"
D:\local\boost_1_67_0\boost/python/operators.hpp(223): error C2976: "boost::python::detail::operator_l": Template parameters are too few
D:\local\boost_1_67_0\boost/python/operators.hpp(40): note: See the declaration of "boost::python::detail::operator_l"
D:\local\boost_1_67_0\boost/python/operators.hpp(223): error C2913: Explicit specialization; "boost::python::detail::operator_l" is not a specialization of a class template
D:\local\boost_1_67_0\boost/python/operators.hpp(223): error C2065: "op_": undeclared identifier
D:\local\boost_1_67_0\boost/python/operators.hpp(223): error C2059: Syntax error: ">"
D:\local\boost_1_67_0\boost/python/operators.hpp(223): error C2976: "boost::python::detail::operator_r": Template parameters are too few
D:\local\boost_1_67_0\boost/python/operators.hpp(45): note: See the declaration of "boost::python::detail::operator_r"
D:\local\boost_1_67_0\boost/python/operators.hpp(223): error C2913: Explicit specialization; "boost::python::detail::operator_r" is not specialization of class template
D:\local\boost_1_67_0\boost/python/operators.hpp(224): error C2913: Explicit customization; "boost::python::detail::operator_l" is not a specialization of the class template
D:\local\boost_1_67_0\boost/python/operators.hpp(224): error C2913: Explicit customization; "boost::python::detail::operator_r" is not a specialization of the class template
```

Reproduce the Windows 10/MSVC 14/Python 3.6 build failure and inspect boost/python/operators.hpp around line 223, along with the operator_l and operator_r declarations around lines 40-45. Determine why this code fails to compile in the reported environment, then verify that the Python binding builds successfully there without introducing the listed errors.

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